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Abstract
In the present study, the lateral heat transfer and fluid flow characteristics between two-phase impinged-jet flow and two-phase channel flow were compared. The effects of volumetric quality (0 − 0.9) on the lateral variation of the Nusselt number were considered. The working fluids are air and water. A circular jet of 470 mm long with a 5.86 mm inner diameter is used. The water jet Reynolds number of 3030 is obtained. The results show that the lateral Nusselt number of the two-phase channel flow is 30 − 40% higher than that of the two-phase impinged-jet flow in the bubble-impact region due to the movement of high-velocity bubbles. Additionally, from the flow visualization, most of the bubbles are observed in the two-phase channel flow and increase the lateral Nusselt number in the bubble-impact region, while most of the bubbles are burst and escaped to the environment air in the jet-impact region and few bubbles float on the hydraulic jump in the two-phase impinged-jet flow, which neither touch the heating surface nor enhance the heat transfer enhancement.
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Notes on contributors
Junbeom Son
Junbeom Son is a B.S. student in Mechanical and Industrial Engineering Department at Youngstown State University, USA. His research interests include two-phase heat transfer enhancement, computational fluid dynamics, and linear friction welding.
Nathan Lin
Nathan Lin is a B.S. student in Mechanical and Industrial Engineering Department at Youngstown State University, USA. His career interests include jet impingement, cyclone separators, and data center energy audit.
John Simcox
John Simcox is a B.S. student in Mechanical and Industrial Engineering Department at Youngstown State University, USA. His career interests include heat transfer analyzation, induction heating, and computational fluid dynamics.
Kyosung Choo
Kyosung Choo is an Associate Professor of Mechanical and Industrial Engineering at Youngstown State University (YSU). He received his Ph.D. from KAIST (Korea Advanced Institute of Science and Technology) in 2011 and has been a postdoctoral fellow at the Center for Environmental Energy Engineering at University of Maryland before joining to YSU. His research is mainly focused in the area of two-phase flow, thermal analysis of additive manufacturing, jet impingement, and energy efficiency of data centers and buildings. He has published over 40 journal and conference papers.